US7573457B2 - Liquid crystal display backlight with scaling - Google Patents
Liquid crystal display backlight with scaling Download PDFInfo
- Publication number
- US7573457B2 US7573457B2 US10/975,713 US97571304A US7573457B2 US 7573457 B2 US7573457 B2 US 7573457B2 US 97571304 A US97571304 A US 97571304A US 7573457 B2 US7573457 B2 US 7573457B2
- Authority
- US
- United States
- Prior art keywords
- luminance
- light source
- pixels
- pixel
- displayed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
Images
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
-
- LCRT=the luminance of the CRT display
- LLCD=the luminance of the LCD display
- Vd=an electronic offset
- γ=the cathode gamma
The attenuation necessary to simulate the operation of a CRT is nonlinear function and a look up table is convenient for use in resealing 92 the light source luminance according to the nonlinear relationship.
Claims (38)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/975,713 US7573457B2 (en) | 2001-11-09 | 2004-10-26 | Liquid crystal display backlight with scaling |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/007,118 US7064740B2 (en) | 2001-11-09 | 2001-11-09 | Backlit display with improved dynamic range |
US10/975,713 US7573457B2 (en) | 2001-11-09 | 2004-10-26 | Liquid crystal display backlight with scaling |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/007,118 Division US7064740B2 (en) | 2001-11-09 | 2001-11-09 | Backlit display with improved dynamic range |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050088400A1 US20050088400A1 (en) | 2005-04-28 |
US7573457B2 true US7573457B2 (en) | 2009-08-11 |
Family
ID=21724317
Family Applications (9)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/007,118 Expired - Lifetime US7064740B2 (en) | 2001-11-09 | 2001-11-09 | Backlit display with improved dynamic range |
US10/973,157 Expired - Fee Related US8378955B2 (en) | 2001-11-09 | 2004-10-25 | Liquid crystal display backlight with filtering |
US10/975,713 Expired - Fee Related US7573457B2 (en) | 2001-11-09 | 2004-10-26 | Liquid crystal display backlight with scaling |
US10/977,788 Expired - Fee Related US7675500B2 (en) | 2001-11-09 | 2004-10-28 | Liquid crystal display backlight with variable amplitude LED |
US10/977,045 Expired - Fee Related US7737936B2 (en) | 2001-11-09 | 2004-10-28 | Liquid crystal display backlight with modulation |
US10/976,715 Expired - Fee Related US7714830B2 (en) | 2001-11-09 | 2004-10-30 | Liquid crystal display backlight with level change |
US11/715,318 Expired - Fee Related US7499017B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
US11/715,319 Expired - Fee Related US7505027B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
US11/715,328 Expired - Fee Related US7505028B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/007,118 Expired - Lifetime US7064740B2 (en) | 2001-11-09 | 2001-11-09 | Backlit display with improved dynamic range |
US10/973,157 Expired - Fee Related US8378955B2 (en) | 2001-11-09 | 2004-10-25 | Liquid crystal display backlight with filtering |
Family Applications After (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/977,788 Expired - Fee Related US7675500B2 (en) | 2001-11-09 | 2004-10-28 | Liquid crystal display backlight with variable amplitude LED |
US10/977,045 Expired - Fee Related US7737936B2 (en) | 2001-11-09 | 2004-10-28 | Liquid crystal display backlight with modulation |
US10/976,715 Expired - Fee Related US7714830B2 (en) | 2001-11-09 | 2004-10-30 | Liquid crystal display backlight with level change |
US11/715,318 Expired - Fee Related US7499017B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
US11/715,319 Expired - Fee Related US7505027B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
US11/715,328 Expired - Fee Related US7505028B2 (en) | 2001-11-09 | 2007-03-08 | Backlit display with improved dynamic range |
Country Status (1)
Country | Link |
---|---|
US (9) | US7064740B2 (en) |
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US7916153B1 (en) | 2002-12-11 | 2011-03-29 | Nvidia Corporation | Backlight dimming and LCD amplitude boost |
USD646451S1 (en) | 2009-03-30 | 2011-10-04 | X6D Limited | Cart for 3D glasses |
USD650956S1 (en) | 2009-05-13 | 2011-12-20 | X6D Limited | Cart for 3D glasses |
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US7675500B2 (en) | 2010-03-09 |
US20050088401A1 (en) | 2005-04-28 |
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US7499017B2 (en) | 2009-03-03 |
US20070159451A1 (en) | 2007-07-12 |
US8378955B2 (en) | 2013-02-19 |
US20050088402A1 (en) | 2005-04-28 |
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